饮用水处理中聚丙烯酰胺对氯胺消毒生成NDMA的贡献

Contribution of polyacrylamide to formation of NDMA during chloramination in drinking water treatment

饮用水处理中使用的高分子絮凝剂是含有酰胺基团的二甲基亚硝胺(NDMA)前体物质,会在净水过程中增加NDMA的生成风险。研究了国内常用的高分子絮凝剂聚丙烯酰胺(PAM)在净水氯胺化过程中生成消毒副产物NDMA的效能。试验结果证明,PAM在与氯氨反应生成NDMA的过程中主要受到PAM投加量、氯胺投加量、反应pH以及反应接触时间等的影响。

Polymeric flocculants used in potable water treatment are amide group-containing dimethylnitrosamine（NDMA）precursors that increase the risk of NDMA formation during water purification.This paper investigated the potential of polyacrylamide（PAM）,apolymer flocculant commonly used in China,to produce disinfection by-product NDMA in the chloramination process during water purification.The results showed that the reaction of PAM with chloramine to produce NDMA was mainly affected by the dosages of PAM and chloramine,the reaction pH and the contact time.